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Rate change delay time
(RCDT)
Figure 1.11 SAS speed negotiation window
Table 1.9 defines the timing specifications for the SAS speed negotiation
sequence.
Table 1.9 SAS speed negotiation sequence timing specifications
Parameter
Rate change delay
time (RCDT)
Speed negotiation
transmit time (SNTT)
Speed negotiation
lock time (SNLT)
Speed negotiation
window time
The speed negotiation sequence shall consist of the following transmission
sequence:
1) a transmission of D.C. idle for an RCDT; and
2) if the phy supports the physical link rate, a transmission of ALIGNs at that
physical link rate for the remainder of the entire speed negotiation window. If
the phy does not support the physical link rate, transmission of D.C. idle for
the remainder of the entire speed negotiation window.
C141-C009
ALIGN(0)s
Speed negotiation lock time(SNLT)
Speed negotiation transmit time(SNTT)
Speed negotiation window
Time
The time the transmitter shall transmit D.C.
750 000 OOBI
idle between rates during speed negotiation.
The time during which ALIGN(0) or
ALIGN(1) is transmitted at each physical link
163 840 OOBI
rate during the speed negotiation sequence.
Derived from: OOBI x 4096 x 40.
The maximum time during the speed
negotiation window for a transmitter to reply
153 600 OOBI
with ALIGN(1). Derived from:
OOBI x 3840 x 40
The duration of a speed negotiation window.
913 840 OOBI
Derived from: RCDT + SNTT.
1.3 Phy layer
ALIGN(1)s
Comments
1-19
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